Selena Gomez: You are the company you keep

All grown up: Child star transformations – The late Steve Irwin's teen daughter, Bindi, is becoming quite the conservationist. She's also advising girls her age to dress more conservatively.

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All grown up: Child star transformations – Matthew Lewis, who starred as the shy and unassuming Neville Longbottom in the "Harry Potter" movies, has grown into a strapping young man. He buffed up for roles as a soldier in "Bluestone 42" and an athlete in "Me Before You."

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All grown up: Child star transformations – Along with her "Harry Potter" co-star Lewis, Emma Watson's proving that she's not little Hermione anymore. The actress played a thief in 2013's "The Bling Ring" and an ax-carrying marauder in "This Is the End."

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All grown up: Child star transformations – Jaden Smith was a baby-faced child star appearing with his dad, Will, in 2006's "The Pursuit of Happyness." Although he once again starred with his father in 2013's "After Earth," teenaged Jaden isn't a kid anymore.

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All grown up: Child star transformations – Along with her older brother Jaden, Willow Smith has blossomed since she first appeared alongside her father in his 2007 film, "I Am Legend." The actress and singer showed a more mature look at the 2013 premiere of "After Earth."

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All grown up: Child star transformations – Haley Joel Osment has been working steadily since his breakout role in 1999's "The Sixth Sense." Osment's intriguing look for his role in the Kevin Smith comedy "Yoga Hosers" has put his career back in the spotlight.

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All grown up: Child star transformations – Tyler Posey co-hosted the 2014 Teen Choice Awards, reuniting onstage with Jennifer Lopez, who played his mother in the 2002 film "Maid in Manhattan."

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All grown up: Child star transformations – Keke Palmer won legions of fans as the spirited adolescent in 2006's "Akeelah and the Bee," but the actress is ready to build her career as an adult. Palmer -- who displayed a more grown-up look at June's "Think Like A Man Too" premiere -- hosted her own daily talk show on BET.

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All grown up: Child star transformations – Angus T. Jones wasn't yet 10 when "Two and a Half Men" premiered on CBS in September 2003. More than a decade later, the now-adult actor has broken away from the sitcom because it conflicts with his religious beliefs. And now ...

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All grown up: Child star transformations – ... Jones, sporting a full beard, is more likely to be found making appearances at churches and speaking about his faith. He spoke at Houston's World Harvest Outreach in March 2014 along with Christian author and motivational speaker Jeremy Anderson, right.

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All grown up: Child star transformations – "Keeping Up with the Kardashians" star Kendall Jenner has come a long way since her adolescent days in braces. The second-to-youngest Kardashian got her start on her family's E! reality show at age 12, but now that she's an adult she's taking over the catwalk.

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All grown up: Child star transformations – Justin Bieber is now in his 20s and, according to his mentor Usher, still in the midst of growing up. But between the tattoos, the vandalism accusations and a recent arrest, Biebs is not the same "Baby" singer we met in 2009.

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All grown up: Child star transformations – Miley Cyrus has been working in show business for more than a decade. The singer/actress has gone from being a fresh-faced preteen to a platinum blond vixen who scandalized the MTV Video Music Awards with her "twerking" in 2013.

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All grown up: Child star transformations – Selena Gomez's appearance hasn't changed dramatically since she starred on the Disney Channel's "Wizards of Waverly Place" in 2007. But her work sure has. Gomez has stretched herself with more mature content, such as the risqué movie "Spring Breakers" and her suggestive single "Come and Get It."

All grown up: Child star transformations – Alyssa Milano, who starred as a preteen on the '80s series "Who's The Boss?," thinks talent is one factor that helps a child star safely transition into more adult roles.

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All grown up: Child star transformations – Vanessa Hudgens came to fame as a Disney Channel star in 2006 but soon stepped away from her wholesome "High School Musical" roots. Last year, the star appeared in more adult projects such as "Spring Breakers" and "Machete Kills."

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All grown up: Child star transformations – It's still hard to believe that Rudy Huxtable is in her 30s. Keshia Knight Pulliam, the actress who played Rudy on "The Cosby Show" from 1984 to 1992, grew up on TV but has acted sporadically since then.

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All grown up: Child star transformations – Macaulay Culkin turned a scream and an exaggerated expression into a blockbuster movie franchise when he starred in 1990's "Home Alone" at the age of 10. He went on to star in 1991's "My Girl," but in recent years he has not been a huge fan of being on camera. In April 2013, he ripped into paparazzi in the United Kingdom for trying to take his photo.

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All grown up: Child star transformations – Along with Knight Pulliam, Raven-Symone is one of the most recognizable child stars around thanks to her work on the long-running "Cosby Show" and her subsequent career on the Disney Channel. The actress, who is now studying at the Academy of Art University in San Francisco, has been in the business since the age of 3.

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All grown up: Child star transformations – "Mad Men" fans have watched Kiernan Shipka grow up as Sally, the daughter of protagonist Don Draper. Having starred on the series since she was 7, Shipka's gone from being a little ballerina with a lisp to a teen girl with enviable poise.

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All grown up: Child star transformations – One minute, Abigail Breslin was a 10-year-old "Little Miss Sunshine," and the next thing we know, she's flashing her bra in 2011's "New Year's Eve." The actress is now grown-up enough to take on the older sister role, as she did in the 2013 release "Ender's Game."

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All grown up: Child star transformations – Along with Hudgens, Zac Efron was just a teen when he became famous with Disney's "High School Musical." Now in his 20s, Efron caters to audiences well past high school, such as his turn in Lee Daniels' film "The Paperboy" and with Seth Rogen in "Neighbors."

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All grown up: Child star transformations – Mary-Kate and Ashley Olsen have been in the entertainment industry since they were literally in diapers -- the pair took turns playing Michelle Tanner on "Full House" from 1987 to 1995. They went on to star in their own movies, but these days the twins are better known for their fashion lines, Elizabeth and James and The Row.

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All grown up: Child star transformations – Best known for his role as Renee Zellweger's cute-beyond-words son in 1996's "Jerry Maguire," Jonathan Lipnicki is now old enough to play Zellweger's love interest.

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All grown up: Child star transformations – Chloë Grace Moretz was a "Kick-Ass" actress even as a kid, starring in movies like "The Amityville Horror" at age 8. Moretz has ditched the Shirley Temple curls but not her action moves -- the star appeared in the "Kick-Ass" sequel in 2013.

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All grown up: Child star transformations – Dakota Fanning has appeared in so many movies and TV shows since age 6 that we could put together her baby book. She's now not only an acclaimed actress but a high school graduate.

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All grown up: Child star transformations – Daniel Radcliffe's development has been watched by millions as he came of age in the "Harry Potter" movie franchise, which launched when he was 12. By 2007, Radcliffe was ready to show how grown-up he'd become, starring in "Equus" -- a stage production that required some nudity.

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All grown up: Child star transformations – Lindsay Lohan showed acting prowess at 12 when she played a set of identical twins in the 1998 remake of "The Parent Trap." Lohan went on to star in movies like "Freaky Friday" (2003) and "Mean Girls" (2004), but her tumultuous private life soon interfered with her career.

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All grown up: Child star transformations – Anna Chlumsky became a star at age 11 thanks to her role in 1991's "My Girl." After sporadic appearances on TV, she landed a hit comedy with HBO's "Veep." Now in her 30s, she welcomed her first child in 2013.

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Story highlights

Selena Gomez has high hopes for new album, "Stars Dance"

The former Disney star says she's become a woman

Gomez is already recording new songs for her next album

Selena Gomez is ready to show off a new side. She's starred in a TV movie sequel to her hit Disney series, "Wizards of Waverly Place," and the edgy, R-rated drama, "Spring Breakers," and this month the former teen queen is celebrating her 21st birthday, releasing her fourth studio album and rehearsing for her first arena tour.

With the release of her new LP, "Stars Dance," the world is getting a glimpse of a more adult Gomez. CNN sat down with the multi-hyphenate on the morning of her birthday, and she opened up about how much she's grown since leaving teendom behind.

"The past year and a half has been really transitional for me, just personally, as well as transitioning into becoming a woman," she said. "I still feel like I'm 15 sometimes and then other times, I'm wanting to feel comfortable in my body and my skin."

For this album, Gomez drew inspiration from her favorite pop star, Britney Spears, as well as from her good friend Taylor Swift for a more mature sound. The former "Mouse House" starlet revealed she is most proud of this album because it is the first time she was able to dedicate herself fully to her music.

"I was able to have full creative control over it. Before, I would have maybe a month or two to record an album, and I'd have to do my series at the same time and tour on the weekends. I wasn't in the right mindset to fully give my all."

Gomez began acting professionally at a young age, nabbing roles in children's programs such as "Barney and Friends." As more former child stars are seen heading down dark and destructive paths, Gomez has always made a conscious effort to keep from falling down the same rabbit hole. The secret? It all comes down to the company you keep.

"I truly believe that you are who you surround yourself with. To me, it's that easy. I have a great family, I have great friends, and my mom is like my mama bear. She's the one that's going to tell me 'no' when everyone around me says 'yes.' It's a good thing to have a tight group that will keep you in check."

"Stars Dance" is a very personal album, Gomez said. Expectations for the disc are high, following three Top 10 debuts from her previous albums. "Come and Get It" marked Gomez's first single to break into the Top 10 on the Billboard Hot 100.

With a 64-date arena tour on the horizon, the performer is determined to strike while the iron's hot.

"I really just want to give it my all. I've never been this tired. Dancing so much, singing constantly, just getting it tight. We want the show to be really big. I want it to be big, but in a grand way, just having my dancers and just bringing it to life."

Despite her hectic schedule and speculation about whether she'll rekindle her relationship with Justin Bieber, Gomez said she has no plans for a break in the near future. In fact, it may not be long before fans will be treated to album No. 5.

"I'm already in the studio now. I actually started working on new stuff and creating a whole fun, different vibe. It's constantly evolving. I'm super-stoked with where this is, and hopefully it will continue to just get better."